@function px2em($px, $base-font-size: 16px) {
	@if (unitless($px)) { 
		@warn "Assuming #{$px} to be in pixels, attempting to convert it into pixels for you"; 
		@return px2em($px + 0px);
    } @else if (unit($px) == em) { 
    	@return $px;
    } 
    @return ($px / $base-font-size) * 1em;
}